Screw-cutting machine.



P. HIRSGH.

SCREW CUTTING MACHINE.

APPLICATION FILED 11011.20, 1911.

Patented June 10, 1913.

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FRANK HIRSCI-I, OF ERIE, PENNSYLVANIA, ASSIGNOR T JARECKI MANUFACTURINGCOMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

SCREW-CUTTING MACHINE.

To all whom 2'75 may concern:

Be it known that I, FRANK Hrnsorr, a citizen of the United States,residing at Erie, in the county of Erie and State of Pennsylvania, haveinvented new and useful Improvements in Screw-Cutting Machines,'of whichthe following is a specification.

This invention relates to screw cutting machines, and consists incertain improvements in the construction thereof as will be hereinafterfully described and pointed out in the claims.

The object of the invention is to provide a screw cutting device with aface cutter which will face a fitting or similar article being threaded.

The invention is illustrated in the accompanying drawings as followsFigure 1 shows a central section of a spindle and cooperating parts.Fig. 2 a section on the line 22 in Fig. 1. Fig. 3 a section on the line3-3 in Fig. 1.

1 marks the spindle bearing, 2 the drive gear for the spindle. This hasan extended hub which is j ournaled in the bearing 1.

3 marks the spindle. The spindle is locked with the gear by means of aspline 4 which is arranged in the grooves A and A" in the gear andspindle respectively. A tap or screw cutting device 5 is screwed into acollar 6 and locked therewith by any convenient means. The collarextends into a cavity in the end of the spindle and is locked therein bya set screw 8. A fitting 9 is shown in place to be operated upon by thetap. The spindle has a reduced extension 10, the reduction forming ashoulder 11 on the spindle. A feed screw 12 is slipped on to theextension and rests against the shoulder 11. It is locked in place bythe nut 13 and locked against rotation on the spindle by the key 14:.

A feed nut 15 is arranged against the end of the bearing 1 and isclamped in place by a yoke 16, the yoke having a crotch, the arms ofwhich terminate in the lugs 17 which extend into detents in the nut 15,thus locking the nut against turning. The yoke 16 has a lug 18 whichcontacts a part of the frame 20 and a bolt 19 extends fro-m the framethrough the yoke 16 and is provided with a nut 19 by means of whichpressure may be exerted on the yoke to clamp the nut 15 against the sideof the bearing 1. The

Specification of Letters Patent.

Application filed November 20, 1911.

Patented June 10, 1913. Serial No. 661,347.

gear 2 is driven by the ordinary mechanism of screw cutting machines soas to advance and withdraw the tap 5.

A reamer or face cutter 21 is arranged in one of the grooves 22 of thetap and extends through a key-way 23 in the-collar 6. In the absence ofother means for locking the cutter with the collar this face cutter willform the key for locking the tap against turning in the collar. The rearend of the reamer is provided with a lateral extension 24 which extendsinto an opening 25 in the nut 26. The nut 26 is arranged in the reamerspindle 27 which extends through the tap spindle 3. The reamer spindle27 terminates in an extended screw thread 28 and extends through theperforation 29 in the bracket 30, the bracket 30 being attached to apart 20 of the machine by a screw 32. A spring 33 is arranged around thereamer spindle 27, one end of the spring rests against the bracket 30and the opposite end against a nut 34 on the screw threaded portion 28.The nut- 34 is locked in adjustment by the nut 35.

It will be seen that as the tap spindle is withdrawn, it engages the endof the extension 10 and withdraws the reamer spindle 27 and reamer withthe tap, this movement being against the pressure exerted by the spring33. As the tap is fed forward, the spring 33 forces the reamer spindleforward with the tap spindle, thus bringing the reamer into cuttingposition to ream or face the fitting. A nut 36 is arranged on the outerend of the reamer spindle and locked in adjustment by the nut 37. Thisnut 36 limits the feed movement of the reamer 21 by coming in contactwith the bracket 30. The feeding movement of the reamer may be adjustedas desired by this nut 36. In other words, the forward movement may bestopped at any point desired to give the proper movement to the reamerby this nut 36. After the feeding movement of the reamer is stopped bythe nut 36, the tap may advance to complete its work. Upon the returnmovement of the tap, itpicks up the reamer spindle by a contact betweenthe extension 10 and nut 35. The point at which the reamer is picked upso as to give sutficient withdrawing movement to the reamer may beadjusted by the nuts and 34 as desired. It will be noted that the springforms a pressure device for exerting pressure on the reamer spindle andthat it is concentrically mounted with the spindle.

hat I claim as new is 1. In a screw cutting machine, the combination ofa spindle; a face cutter rotated with the spindle; a screw cuttercarried by the spindle; a feed screw operating on the spindle; a springmounted concentrically with the spindle exerting pressure on the facecutter to actuate it in one direction; and

. means actuated by the spindle for actuating the face cutter axiallywith the spindle and against the spring in the opposite direction.

2. In a screw cutting machine, the combination of a screw cutterspindle; a face cutter actuated with said spindle; a screw cuttercarried by said spindle; a feed screw operating on said spindle; a facecutter spindle extending from the face cutter within the screw cutterspindle; and devices in dependent of the spindle operating upon the rearend of the face cutter spindle for actuating the same to force the facecutter forward into feeding position and to withdraw the same.

3. In a screw cutting machine, the combination of a screw cutterspindle; a face cutter actuated with said spindle; a screw cuttercarried by said spindle; a feed screw operating on said spindle; a facecutter spindle extending from the face cutter within the screw cutterspindle; devices operating upon the rear end of the face cutter spindlefor actuating the same to force the face cutter forward into feedingposition and to withdraw the same; and means acting on the face cutterspindle for limiting its movement relatively to the movement of thescrew cutter spindle.

4:. In a screw cutting machine, the combination of a screw cutterspindle; a face cutter actuated with said spindle; a screw cuttercarried by said spindle; a feed screw operating on said spindle; a facecutter spindle extending from the face cutter within the screw cutterspindle; devices operating upon the rear end of the face cutter spindlefor actuating the same to force the face cutter forward into feedingposit-ion and to withdraw the same; means operatingthe rear end of theface cutter spindle for giving it a feed movement coincident to thefeeding movement of the screw cutter spindle through a part of thetravel of the screw cutter spindle; and a stop for limiting the movementof the feed cutter spindle to less than the movement of the screw cutterspindle.

5. In a screw cutting machine, the combination of a screw cutterspindle; a face cutter rotated with said spindle; a screw cutter carriedby said spindle; a feed screw operating on said spindle; a face cutterspindle extending within the screw cutter spindle; a yielding pressuredevice operating upon the face cutter spindle for actuating it in onedirection; and means for connecting the face cutter spindle with thescrew cutter spindle for actuating the face cutter spindle against thepressure device in the opposite direction.

6. In ascrew cutting machine, the combination of a screw cutter spindle;a face cutter rotated with said spindle; a screw cutter carried by saidspindle; a feed screw operating on said spindle; a face cutter spindleextending within the screw cutter spindle; a spring arranged on saidface cutter spindle for exerting pressure on said face cutter spindle inone direction; and a base independent of the spindle for the sprin 7. Ina screw cutting machine, the combination of a screw cutter spindle;aface cutter rotated with said spindle; a screw cutter carried by saidspindle; a feed screw operating on said spindle; a face cutter spindleextending within the screw cutter spindle; a spring arranged on saidface cutter spindle for exerting pressure on said face cutter spindle inone direction; a base independent of the spindle for the spring andadjustable stops for controlling and limiting the movement of the facecutter spindle.

8. In a screw cutting machine, the combination of a screw cutterspindle; a face cutter carried by said spindle; a screw cutter carriedby said spindle; a feed screw for said spindle; a face cutter spindlecarried by the screw cutter spindle; a nut on the face cutter spindlehaving a transverse perforation therein; a lateral projection on theface cutter arranged in said perforation; and means operating on theface cutter spindle for controlling the feed movement of the facecutter.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

FRANK HIRSCH. \Vitnesses JOHN J. BEMER, I3. M. HARTMAN.

Copies of thispatent may be obtained for five cents each, by addressingthe Commissioner of Batentsi Washington, D. G.

